This is basically a trainmaster/assistant trainmaster type position (Transportation dept.).
If it is as part of the formal management training program, you can expect to be moving around the system both during your training phase, and after you have been placed as a manager. Trainmasters -- if they desire to get experience in different parts of the operation (and get promoted) -- should expect relocation about every two years or so.
Chances are you won't have any choice in where you are placed on your first assignment (and most of the subsequent, too).
Salary is something I can't tell you about. My guess is that they will offer what they feel your prior experience supports in the job market within the range for the position. Military experience, assuming it's the right kind, is usually a positive. Military transportation personnel are given priority in most cases, assuming the interviews go well.
This is an excellent opportunity for those who can take the pressure of a daily operation where much of what happens is beyond your direct control (even though you're responsible for it all!). Some people have what it takes to do well in such an environment, and many do not.
Those who do well stand an excellent chance of advancing in the company, since management trainees are given promotion priority in many cases.
As in the military, you'll have a better career if you make acquaintance with (and make a good impression upon) someone in a higher position that you can follow as they advance in the organization.
It can be a good living, but can be tough on your family (again -- a lot like the military). BNSF burns through a good many of these people regularly, so good luck with the interview and the job (assuming you still want it!).